<?php

//include("config.php");
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

          //extract post data
        if (!empty($postStr)){

                 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>";             
                $ev = $postObj->Event;
                if ($ev == "subscribe")
                {
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[news]]></MsgType>
                             <ArticleCount>1</ArticleCount>
                             <Articles>
                             <item>
                             <Title><![CDATA[欢迎关注]]></Title> 
                             <Description><![CDATA[创意与科技]]></Description>
                             <PicUrl><![CDATA[http://jiekouphp.duapp.com/img/tp1.jpg]]></PicUrl>
                             <Url><![CDATA[http://www.baidu.com]]></Url>
                             </item>
                                                      </Articles>
                             <FuncFlag>1</FuncFlag>
                            </xml>";    


                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time);
                   echo $resultStr;
                }

                if(!empty( $keyword ))
                {
                      $msgType = "text";
                    switch ($keyword)
                    {
                    case "1";
                    $contentStr = "公司简介!";
                    break;
                    case "2";
                    $contentStr = "最新优惠!";
                    break;
                    default;
                    $contentStr = "欢迎光临!";
                    }

                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }

        }else {
            echo "";
            exit;
        }
    }

    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];    

        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}

?>